/
manifold.go
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/
manifold.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package undertaker
import (
"github.com/juju/errors"
"github.com/juju/juju/api/base"
"github.com/juju/juju/environs"
"github.com/juju/juju/worker"
"github.com/juju/juju/worker/dependency"
)
// ManifoldConfig holds the names of the resources used by, and the
// additional dependencies of, an undertaker worker.
type ManifoldConfig struct {
APICallerName string
EnvironName string
NewFacade func(base.APICaller) (Facade, error)
NewWorker func(Config) (worker.Worker, error)
}
func (config ManifoldConfig) start(context dependency.Context) (worker.Worker, error) {
var apiCaller base.APICaller
if err := context.Get(config.APICallerName, &apiCaller); err != nil {
return nil, errors.Trace(err)
}
var environ environs.Environ
if err := context.Get(config.EnvironName, &environ); err != nil {
return nil, errors.Trace(err)
}
facade, err := config.NewFacade(apiCaller)
if err != nil {
return nil, errors.Trace(err)
}
worker, err := config.NewWorker(Config{
Facade: facade,
Environ: environ,
})
if err != nil {
return nil, errors.Trace(err)
}
return worker, nil
}
// Manifold returns a dependency.Manifold that runs a worker responsible
// for shepherding a Dying model into Dead and ultimate removal.
func Manifold(config ManifoldConfig) dependency.Manifold {
return dependency.Manifold{
Inputs: []string{
config.APICallerName,
config.EnvironName,
},
Start: config.start,
}
}